An island detection method and an island detection system
An island detection and coordinate system technology, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, can solve the problems of affecting the quality of inverter output power and large blind areas of island detection, and achieve the elimination of island detection blind areas and steady-state power Good quality and wide range of effects
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Embodiment 1
[0042] The invention provides an islanding detection method, which is suitable for a grid-connected inverter that adopts grid voltage orientation, and the grid-connected inverter has a local load, and the local load can be pure resistive load, inductive load and capacitive load. random combination.
[0043] see figure 1 , is a grid-connected inverter topology with local load (RLC), point A is the grid-connected point, and its power equation can be described as:
[0044] P load +jQ load =(P inv +ΔP)+j(Q inv +ΔQ)
[0045] Among them, P load Active power dissipated for the local load, Q load Reactive power dissipated for local load, P inv is the active power output by the grid-connected inverter, Q inv is the reactive power output by the grid-connected inverter, ΔP is the active power exchanged between the grid-connected point and the grid, and ΔQ is the reactive power exchanged between the grid-connected point and the grid. When it is zero, that is, the grid-connected in...
Embodiment 2
[0072] see Figure 7 , the present application also discloses an islanding detection system, the system includes: a sampling module (not shown) for sampling three-phase voltage and three-phase current signals of the grid-connected point; a phase-locked loop 1 for The three-phase voltage signal U of the network point a , U b , U c Phase locking is performed, and the angle orientation error value err_q of the voltage at the grid-connected point is output; the proportional-differential regulator 2 is used to perform proportional-differential adjustment on the angle orientation error value err_q to obtain the disturbance amount of the reactive power command of the grid-connected inverter ΔVq; the adder 3 is used to superimpose the disturbance quantity ΔVq of the reactive power command on the grid-connected inverter reactive current command Iq_ref; the reactive power control module 4 is used to superimpose the reactive power according to the superimposed disturbance quantity The...
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